Brandon Long and David Iliffe Australia's largest private cattle feedlot company is looking for a new owner, and the price tag is expected to be in the hundreds of millions of dollars. Mort & Co, which fattens hundreds of thousands of cattle on grain before being slaughtered for beef, has put the majority of its assets on the market. That includes Grassdale, the largest feedlot in the country with 78,000 head, located near Dalby in Queensland's Darling Downs region.